Abstract
The KLL Auger spectrum of Sm (Z=62) following the electron capture decay of radioactive 147,148,149Eu atoms in a solid state source was measured with the instrumental resolution of 14eV. Energies and relative intensities of all the nine basic spectrum components were determined and compared with those of the previous measurement and theoretical predictions. Our absolute Auger transition energy 32627.3±1.4eV for the dominant KL2L3(1D2) transition was found to be higher by 16.0±1.4eV than that one of the widely used relativistic semi-empirical calculations by Larkins. Taking into account results of our measurements of the L3M4M5(1G4), L3M5M5(3F4), and KL2L3(1D2) Auger lines from both the EC decay and the β− decay for atomic numbers Z=62 and 64 and also previous experimental data a conclusion is made that the discrepancy found is caused by the “atomic structure effect”. The measured value for the KL1L2(3P0/1P1) transition intensity ratio proved strong influence of the relativistic effects on the intensity distribution between the 3P0 and 1P1 doublet components.
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